G. Answer the following questions in brief.
1. State two important characteristics of heat energy.
2. Why do clinical thermometers measure a limited range of temperatures?
3.
Write a short note on clinical thermometers.
4. Why do we install air conditioners high up in a room?
5. Why do we wear dark-coloured clothes in winter and light-coloured clothes in summer?
questions in detail.
with the units fixed
Answers
Answer:
Answer 1. For the characteristics part: As pointed out the heat flow is governed by temperature gradient, No gradient no heat. Another important aspect of heat is its quality . Quality is the measure of how much useful work can be obtained by the heat.
Answer 2. A clinical thermometer cannot be used to measure high temperatures because it has been designed to measure only human body temperature which varies over a short range. If a clinical thermometer is used to measure high temperatures, it will get damaged.
Answer 3. A clinical thermometer is a thermometer used to measure human body temperature. Most made in the 20th century are mercury-in-glass thermometers. They are accurate and sensitive, having a narrow place where the mercury level rises very fast. A kink in the tube stops the mercury level from falling on its own.
Answer 4. This is because when air conditioner is installed at the certain height, it help to cool the air closer to ceiling. ... Cold air is heavier than warm air so by placing the AC unit high on the wall, it pulls in hot air and blows out cold air which circulates around the room, cooling the ambient temperature of the room.
Answer 5. But in winters, the dark color clothes absorb a lot of heat because they are good conductors of heat, and they absorb most of the heat energy fallen on them. Thus, in summer we preferred to wear light or white color clothes and in winter, to wear dark color clothes.
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